Background color of the RadioButton group

I have a bunch of RadioButtons which I created as follows:
def chartOptions = for (c in list)
RadioButton {
toggleGroup: ToggleGroup {}
text: c
}

I need some way of grouping these by showing a common background color.
In Java, I used to do this by adding the component to a JPanel and setting the background color.
How can I do the same in JavaFX?